Exam (elaborations)
BIOS 251 Final Exam: Questions & Verified Answers
- Course
- Institution
BIOS 251 Final Exam: Questions & Verified Answers
[Show more]
Content preview
BIOS 251 Final Exam: Questions & Verified AnswersComponents of the homeostatic control loop Right Ans - receptor, control
center, effector
Negative feedback Right Ans - -works to oppose change
-brings condition back to a set point
Positive feedback Right Ans - -works to enhance change
-brings condition further away from a set point
Tonicity Right Ans - relates to how the solution influences the shape of
body cells
Hypotonic solution Right Ans - RBC undergoes hemolysis (swelling)
Hypertonic solution Right Ans - RBC undergoes crenation (shrinking)
Osmosis Right Ans - -concentration of solutes per liter
-water moves from high concentration of water to low concentration of water
Factors that influence diffusion across a cell membrane Right Ans - -
steepness of concentration gradient
-temperature
-mass of diffusing substance
-surface area
-diffusion distance
Passive processes that move substances across the cell membrane Right
Ans - -Simple diffusion
-Facilitated diffusion
Osmosis processes that move substances across the cell membrane Right
Ans - -Active processes
-Active transport
-Vesicular transport
, Primary active transport Right Ans - energy derived from ATP changes the
shape of a transporter protein which pumps a substance across a plasma
membrane against its concentration gradient
Secondary active transport Right Ans - -energy stored (in a hydrogen or
sodium concentration gradient) is used to drive other substances against their
own concentration gradients
-substance is being transported "against its will"
Types of active transport in vesicles Right Ans - -endocytosis
-phagocytosis
-pinocytosis
-exocytosis
-transocytosis
Endocytosis Right Ans - cell takes up specific ligands that bind to cell
surface receptors into a vesicle
Phagocytosis Right Ans - -cell engulfs large particles such as old cell parts,
viruses, bacteria
-used by many immune system cells
Pinocytosis Right Ans - -cells take up small droplets of ECF
-no receptors involved
-"cell drinking"
Exocytosis Right Ans - -membrane-enclosed secretory vesicles fuse w/the
plasma membrane and release their contents into the ECF
-used to secretions such as sweat, oil
Transocytosis Right Ans - -a combination of endocytosis and exocytosis
used to move substances from one side of a cell, across it, and out the other
side
-example: capillary moves hormones to other side of vessel to be released into
blood via exocytosis
Merocrine secretion Right Ans - cells excrete their substances by
exocytosis
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LeCrae. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73243 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
